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Gamma-ray Bursts (GRBs) are flashes of gamma-rays thought to originate fromrare forms of massive star collapse (long GRBs), or from mergers of compactbinaries (short GRBs) containing at least one neutron star (NS). The nature ofthe post-explosion / post-merger remnant (NS versus black hole, BH) remainshighly debated. In ~50% of both long and short GRBs, the temporal evolution ofthe X-ray afterglow that follows the flash of gamma-rays is observed to"plateau" on timescales of 100-10000 s since explosion, possibly signaling thepresence of energy injection from a long-lived, highly magnetized NS(magnetar). The Cross-Correlation Algorithm (CoCoA) proposed by [R. Coyne et.al., (2016)] aims to optimize searches for intermediate-duration (100-10000s)gravitational waves (GWs) from GRB remnants. In this work, we test CoCoA onreal data collected with ground-based GW detectors. We further develop thedetection statistics on which CoCoA is based to allow for multi-waveformsearches spanning a physically-motivated parameter space, so as to account foruncertainties in the physical properties of GRB remnants.

Multi-waveform cross-correlation search method for intermediate-duration gravitational waves from gamma-ray bursts